US9911487B2 - Method and system for storing and recovering data from flash memory - Google Patents

Method and system for storing and recovering data from flash memory Download PDF

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US9911487B2
US9911487B2 US14/754,838 US201514754838A US9911487B2 US 9911487 B2 US9911487 B2 US 9911487B2 US 201514754838 A US201514754838 A US 201514754838A US 9911487 B2 US9911487 B2 US 9911487B2
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solid state
toc
physical address
state memory
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US20160343429A1 (en
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Nils Nieuwejaar
Jeffrey S. Bonwick
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EMC Corp
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EMC IP Holding Co LLC
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Priority to CN201610200629.XA priority patent/CN106168925B/zh
Priority to JP2016099400A priority patent/JP6506723B2/ja
Priority to EP16170491.1A priority patent/EP3096221B1/en
Assigned to CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH, AS COLLATERAL AGENT reassignment CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH, AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: ASAP SOFTWARE EXPRESS, INC., AVENTAIL LLC, CREDANT TECHNOLOGIES, INC., DELL INTERNATIONAL L.L.C., DELL MARKETING L.P., DELL PRODUCTS L.P., DELL SOFTWARE INC., DELL SYSTEMS CORPORATION, DELL USA L.P., EMC CORPORATION, EMC IP Holding Company LLC, FORCE10 NETWORKS, INC., MAGINATICS LLC, MOZY, INC., SCALEIO LLC, SPANNING CLOUD APPS LLC, WYSE TECHNOLOGY L.L.C.
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Assigned to THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. reassignment THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. SECURITY AGREEMENT Assignors: CREDANT TECHNOLOGIES INC., DELL INTERNATIONAL L.L.C., DELL MARKETING L.P., DELL PRODUCTS L.P., DELL USA L.P., EMC CORPORATION, EMC IP Holding Company LLC, FORCE10 NETWORKS, INC., WYSE TECHNOLOGY L.L.C.
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    • G06F2212/7207—Details relating to flash memory management management of metadata or control data

Definitions

  • FIGS. 6A-6C show flowcharts in accordance with one or more embodiments of the technology.
  • a single client and a single storage appliance may be considered part of a single PCIe Fabric.
  • any combination of one or more clients and one or more storage appliances may be considered part of a single PCIe Fabric.
  • the individual components within the storage appliance communicate using PCIe
  • individual components in the client see FIG. 1D
  • all the components in the storage appliance and the client may be considered part of a single PCIe Fabric.
  • FIG. 1C shows a system in which clients ( 100 A, 100 M) are connected to multiple storage appliances ( 104 A, 104 B, 104 C, 104 D) arranged in a fan-out configuration.
  • each client ( 100 A, 100 M) is connected to one or more of the storage appliances ( 104 A, 104 B, 104 C, 104 D); however, there is no communication between the individual storage appliances ( 104 A, 104 B, 104 C, 104 D).
  • the client switch ( 116 ) includes only a single switch. In another embodiment of the technology, the client switch ( 116 ) includes multiple interconnected switches. If the client switch ( 116 ) includes multiple switches, each switch may be connected to every other switch, may be connected to a subset of the switches in the switch fabric, or may only be connected to one other switch. In one embodiment of the technology, each of the switches in the client switch ( 116 ) is a combination of hardware and logic (implemented, for example, using integrated circuits) (as defined by the protocol(s) the switch fabric implements) that is configured to permit data and messages to be transferred between the client ( 110 ) and the storage appliances (not shown).
  • the client switch ( 116 ) includes a number of ports, where each port may be configured as a transparent bridge or a non-transparent bridge.
  • Ports implemented as transparent bridges allow the root complex to continue discovery of devices (which may be other root complexes, switches, PCI bridges, or endpoints) connected (directly or indirectly) to the port.
  • the root complex treats such a port as an endpoint.
  • At least one switch in the switch fabric ( 206 ) is configured to implement multicasting. More specifically, in one embodiment of the technology, the processor ( 208 ) is configured to generate a multicast group where the multicast group includes two or more members with each member specifying an address in the memory ( 210 ) and/or in the storage modules ( 214 A, 214 N). When the multicast group is created, the multicast group is associated with a multicast address. In order to implement the multicasting, at least one switch in the switch fabric is configured that when a write specifying the multicast address as the destination address is received, the switch is configured to generate a new write for each member in the multicast group and issue the writes to the appropriate address in the storage appliance. In one embodiment of the technology, the address for each write generated by the switch is determined by adding a particular offset to the multicast address.
  • FIG. 4A shows a storage module in accordance with one or more embodiments of the technology.
  • the solid state memory module ( 400 ) includes one or more blocks.
  • a block is the smallest erasable unit of storage within the solid state memory module ( 400 ).
  • block ( 408 ) only includes data pages and TOC pages
  • block ( 408 ) may include pages (e.g., a page that includes parity data) other than data pages and TOC pages without departing from the technology.
  • Such other pages may be located within the block and, depending on the implementation, interleaved between the TOC pages and the data pages.
  • each TOC entry ( 430 ) includes metadata for a frag (and in particular the user data in the frag) and may include one or more of the following fields: (i) object ID ( 432 ), which identifies the object (e.g., file) being stored; (ii) the birth time ( 434 ), which specifies the time (e.g., the processor clock value of the processor in the control module) at which the frag corresponding to the TOC entry was written to the vaulted memory; (iii) offset ID ( 436 ), which identifies the starting point of the user data in the frag relative to the beginning of the object (identified by the object ID); (iv) fragment size ( 438 ), which specifies the size of the frag; (v) page ID ( 440 ), which identifies the page in the block in which the frag is stored; (vi) byte ( 442 ), which identifies the object ID ( 432 ), which identifies the object (e.g., file) being stored; (ii
  • step 636 the provisional physical address ( 478 ) in the open TOC page is changed to a final physical address (i.e., the actual location in the block in which the TOC page (or the content of the TOC page) is to be stored).
  • a final physical address i.e., the actual location in the block in which the TOC page (or the content of the TOC page) is to be stored.
  • padding may be added to the open TOC page in order to fill the TOC page.
  • step 638 a determination is made about whether the block includes another TOC page. If the block includes another TOC page, the process proceeds to step 640 ; otherwise the process proceeds to step 642 .
  • step 640 a reference to the most recently stored TOC page in the block is included in the TOC page created in step 636 (e.g., TOC page ( 410 ) references TOC page ( 412 ) in FIG. 4E ).
  • embodiments of the technology enable the creation of an in-memory data structure, which allows the control module to access user data in a single look-up step. Said another way, the control module may use the in-memory data structure to directly ascertain the physical address(es) of the user data in the storage appliance. Using this information, the control module is able to directly access the user data and does not need to traverse any intermediate metadata hierarchy in order to obtain the user data.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Retry When Errors Occur (AREA)
  • Memory System (AREA)
  • Multi Processors (AREA)
US14/754,838 2015-05-19 2015-06-30 Method and system for storing and recovering data from flash memory Active 2036-05-13 US9911487B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US14/754,838 US9911487B2 (en) 2015-05-19 2015-06-30 Method and system for storing and recovering data from flash memory
CN201610200629.XA CN106168925B (zh) 2015-05-19 2016-03-31 用于存储和从闪存恢复数据的方法和系统
JP2016099400A JP6506723B2 (ja) 2015-05-19 2016-05-18 データを格納するための方法およびデータを格納するための一時的でないコンピュータ読取可能記録媒体
EP16170491.1A EP3096221B1 (en) 2015-05-19 2016-05-19 Method and system for storing and recovering data from flash memory
US15/875,685 US10229734B1 (en) 2015-05-19 2018-01-19 Method and system for storing and recovering data from flash memory
JP2018106914A JP6872513B2 (ja) 2015-05-19 2018-06-04 データを格納するための方法およびデータを格納するための一時的でないコンピュータ読取可能記録媒体

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US14/754,838 US9911487B2 (en) 2015-05-19 2015-06-30 Method and system for storing and recovering data from flash memory

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US20160343429A1 (en) 2016-11-24
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